ASP.NET Web API and OpenID Connect: how to get Access Token from Authorization Code

Question

I try to get OpenID Connect running... A user of my Web API managed to get an Authorization Code of a OpenID Connect Provider. How am I supposed to pass this code to my ASP.NET

Answer 1

Looks like the recommended approach is to use the AuthorizationCodeReceived event to exchange the Auth code for an Access Token. Vittorio has a blog entry that outlines the overall flow.

Here's an example from this sample app on GitHub of the Startup.Auth.cs code to set this up:

app.UseOpenIdConnectAuthentication(
    new OpenIdConnectAuthenticationOptions
    {
        ClientId = clientId,
        Authority = Authority,
        Notifications = new OpenIdConnectAuthenticationNotifications()
        {
            AuthorizationCodeReceived = (context) =>
           {
               var code = context.Code;
               ClientCredential credential = new ClientCredential(clientId, appKey);
               string tenantID = context.AuthenticationTicket.Identity.FindFirst("http://schemas.microsoft.com/identity/claims/tenantid").Value;
               string signedInUserID = context.AuthenticationTicket.Identity.FindFirst(ClaimTypes.NameIdentifier).Value;
               AuthenticationContext authContext = new AuthenticationContext(string.Format("https://login.windows.net/{0}", tenantID), new EFADALTokenCache(signedInUserID));
               AuthenticationResult result = authContext.AcquireTokenByAuthorizationCode(
                           code, new Uri(HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Path)), credential, graphResourceID);

               return Task.FromResult(0);
            },
            ...
    }

Note: The AuthorizationCodeReceived event is invoked only once when authorization really takes place. If the auth code is already generated and stored, this event is not invoked. You have to logout or clear cookies to force this event to take place.